Nuribou #49
Colour the grey cells of the grid black or white. The black cells divide the grid into orthogonal areas of white cells. They must not touch each other orthogonally (but diagonally).
A cell with a number is always white; to each white area belongs exactly one cell with a number. The number shows how many cells make up the white area.
The black cells must form horizontal or vertical stripes that are exactly one cell wide. If two black stripes touch diagonally, they must be of different lengths.